Online PHP editor | output for MkShN

<?php class A{ static $default="A::default "; public static $public="A::public "; protected static $protected="A::protected "; private static $private="A::private "; function static test(){ echo $this::$default; echo $this::$public; echo static::$protected; echo static::$private;//error } } class B extends A{ static $default="B::default "; public static $public="B::public "; protected static $protected="B::protected "; private static $private="B::private "; } B::test();